Shale reservoir permeability dynamic prediction method under synergistic effect of complex mechanism

• Main Authors: ZHANG YING, ZHAN JIE, ZHENG ZIGANG
• Format: Patent
• Language: Chinese; English
• Published: 29.05.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a dynamic prediction method for shale reservoir permeability under the synergistic effect of a complex mechanism. The method comprises the following steps: correcting a non-circular pore with a pore section of a shale reservoir into a circular pore; carrying out quantitative characterization on pore size evolution by utilizing a pore equivalent diameter; determining a poresize fractal factor based on a fractal coarsening theory; calculating the length of a hollow billet and the number of pores in a preset range according to the pore size fractal factor, calculating thesectional area of the porous medium and the volume flow of a hollow billet bundle by utilizing a real-time pore equivalent radius and the pore number in the preset range; calculating the shale apparent permeability of the pores with different sections by utilizing hollow billet length, hollow billet bundle volume flow and the porous medium sectional area, and calculating the shale apparent permeability according to the pr